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gecko-dev/parser/html/nsHtml5Parser.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Henri Sivonen <hsivonen@iki.fi>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef NS_HTML5_PARSER__
#define NS_HTML5_PARSER__
#include "nsAutoPtr.h"
#include "nsTimer.h"
#include "nsIParser.h"
#include "nsDeque.h"
#include "nsIURL.h"
#include "nsParserCIID.h"
#include "nsITokenizer.h"
#include "nsThreadUtils.h"
#include "nsIContentSink.h"
#include "nsIParserFilter.h"
#include "nsIRequest.h"
#include "nsIChannel.h"
#include "nsCOMArray.h"
#include "nsContentSink.h"
#include "nsIHTMLDocument.h"
#include "nsIUnicharStreamListener.h"
#include "nsCycleCollectionParticipant.h"
#include "nsAutoPtr.h"
#include "nsIInputStream.h"
#include "nsIUnicodeDecoder.h"
#include "nsICharsetDetectionObserver.h"
#include "nsDetectionConfident.h"
#include "nsHtml5UTF16Buffer.h"
#include "nsHtml5MetaScanner.h"
#define NS_HTML5_PARSER_READ_BUFFER_SIZE 1024
#define NS_HTML5_PARSER_SNIFFING_BUFFER_SIZE 512
enum eHtml5ParserLifecycle {
/**
* The parser has told the tokenizer to start yet.
*/
NOT_STARTED = 0,
/**
* The parser has started the tokenizer and the stream hasn't ended yet.
*/
PARSING = 1,
/**
* The parser hasn't told the tokenizer to emit EOF yet, but the network
* stream has been exhausted or document.close() called.
*/
STREAM_ENDING = 2,
/**
* The parser has told the tokenizer to emit EOF.
*/
TERMINATED = 3
};
enum eBomState {
/**
* BOM sniffing hasn't started.
*/
BOM_SNIFFING_NOT_STARTED = 0,
/**
* BOM sniffing is ongoing, and the first byte of an UTF-16LE BOM has been
* seen.
*/
SEEN_UTF_16_LE_FIRST_BYTE = 1,
/**
* BOM sniffing is ongoing, and the first byte of an UTF-16BE BOM has been
* seen.
*/
SEEN_UTF_16_BE_FIRST_BYTE = 2,
/**
* BOM sniffing is ongoing, and the first byte of an UTF-8 BOM has been
* seen.
*/
SEEN_UTF_8_FIRST_BYTE = 3,
/**
* BOM sniffing is ongoing, and the first and second bytes of an UTF-8 BOM
* have been seen.
*/
SEEN_UTF_8_SECOND_BYTE = 4,
/**
* BOM sniffing was started but is now over for whatever reason.
*/
BOM_SNIFFING_OVER = 5
};
class nsHtml5Parser : public nsIParser,
public nsIStreamListener,
public nsICharsetDetectionObserver,
public nsIContentSink,
public nsContentSink {
public:
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsHtml5Parser, nsContentSink)
nsHtml5Parser();
virtual ~nsHtml5Parser();
/* Start nsIParser */
/**
* No-op for backwards compat.
*/
NS_IMETHOD_(void) SetContentSink(nsIContentSink* aSink);
/**
* Returns |this| for backwards compat.
*/
NS_IMETHOD_(nsIContentSink*) GetContentSink(void);
/**
* Always returns "view" for backwards compat.
*/
NS_IMETHOD_(void) GetCommand(nsCString& aCommand);
/**
* No-op for backwards compat.
*/
NS_IMETHOD_(void) SetCommand(const char* aCommand);
/**
* No-op for backwards compat.
*/
NS_IMETHOD_(void) SetCommand(eParserCommands aParserCommand);
/**
* Call this method once you've created a parser, and want to instruct it
* about what charset to load
*
* @param aCharset the charset of a document
* @param aCharsetSource the source of the charset
*/
NS_IMETHOD_(void) SetDocumentCharset(const nsACString& aCharset, PRInt32 aSource);
/**
* Getter for backwards compat.
*/
NS_IMETHOD_(void) GetDocumentCharset(nsACString& aCharset, PRInt32& aSource)
{
aCharset = mCharset;
aSource = mCharsetSource;
}
/**
* No-op for backwards compat.
*/
NS_IMETHOD_(void) SetParserFilter(nsIParserFilter* aFilter);
/**
* Get the channel associated with this parser
* @param aChannel out param that will contain the result
* @return NS_OK if successful or NS_NOT_AVAILABLE if not
*/
NS_IMETHOD GetChannel(nsIChannel** aChannel);
/**
* Return |this| for backwards compat.
*/
NS_IMETHOD GetDTD(nsIDTD** aDTD);
/**
* Unblocks parser and calls ContinueInterruptedParsing()
*/
NS_IMETHOD ContinueParsing();
/**
* If scripts are not executing, maybe flushes tree builder and parses
* until suspension.
*/
NS_IMETHOD ContinueInterruptedParsing();
/**
* Don't call. For interface backwards compat only.
*/
NS_IMETHOD_(void) BlockParser();
/**
* Unblocks the parser.
*/
NS_IMETHOD_(void) UnblockParser();
/**
* Query whether the parser is enabled or not.
*/
NS_IMETHOD_(PRBool) IsParserEnabled();
/**
* Query whether the parser thinks it's done with parsing.
*/
NS_IMETHOD_(PRBool) IsComplete();
/**
* Set up request observer.
*
* @param aURL ignored (for interface compat only)
* @param aListener a listener to forward notifications to
* @param aKey the root context key (used for document.write)
* @param aMode ignored (for interface compat only)
*/
NS_IMETHOD Parse(nsIURI* aURL,
nsIRequestObserver* aListener = nsnull,
void* aKey = 0,
nsDTDMode aMode = eDTDMode_autodetect);
/**
* document.write and document.close
*
* @param aSourceBuffer the argument of document.write (empty for .close())
* @param aKey a key unique to the script element that caused this call
* @param aContentType ignored (for interface compat only)
* @param aLastCall true if .close() false if .write()
* @param aMode ignored (for interface compat only)
*/
NS_IMETHOD Parse(const nsAString& aSourceBuffer,
void* aKey,
const nsACString& aContentType,
PRBool aLastCall,
nsDTDMode aMode = eDTDMode_autodetect);
/**
* Gets the key passed to initial Parse()
*/
NS_IMETHOD_(void *) GetRootContextKey();
/**
* Stops the parser prematurely
*/
NS_IMETHOD Terminate(void);
/**
* Don't call. For interface backwards compat only.
*/
NS_IMETHOD ParseFragment(const nsAString& aSourceBuffer,
void* aKey,
nsTArray<nsString>& aTagStack,
PRBool aXMLMode,
const nsACString& aContentType,
nsDTDMode aMode = eDTDMode_autodetect);
/**
* Invoke the fragment parsing algorithm (innerHTML).
*
* @param aSourceBuffer the string being set as innerHTML
* @param aTargetNode the target container (must QI to nsIContent)
* @param aContextLocalName local name of context node
* @param aContextNamespace namespace of context node
* @param aQuirks true to make <table> not close <p>
*/
NS_IMETHOD ParseFragment(const nsAString& aSourceBuffer,
nsISupports* aTargetNode,
nsIAtom* aContextLocalName,
PRInt32 aContextNamespace,
PRBool aQuirks);
/**
* Calls ParseUntilSuspend()
*/
NS_IMETHOD BuildModel(void);
/**
* Removes continue parsing events
*/
NS_IMETHODIMP CancelParsingEvents();
/**
* Sets the state to initial values
*/
virtual void Reset();
/**
* True in fragment mode and during synchronous document.write
*/
virtual PRBool CanInterrupt();
/* End nsIParser */
//*********************************************
// These methods are callback methods used by
// net lib to let us know about our inputstream.
//*********************************************
// nsIRequestObserver methods:
NS_DECL_NSIREQUESTOBSERVER
// nsIStreamListener methods:
NS_DECL_NSISTREAMLISTENER
/**
* Fired when the continue parse event is triggered.
*/
void HandleParserContinueEvent(class nsHtml5ParserContinueEvent *);
// EncodingDeclarationHandler
/**
* Tree builder uses this to report a late <meta charset>
*/
void internalEncodingDeclaration(nsString* aEncoding);
// DocumentModeHandler
/**
* Tree builder uses this to report quirkiness of the document
*/
void documentMode(nsHtml5DocumentMode m);
// nsICharsetDetectionObserver
/**
* Chardet calls this to report the detection result
*/
NS_IMETHOD Notify(const char* aCharset, nsDetectionConfident aConf);
// nsIContentSink
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD WillParse();
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD WillBuildModel(nsDTDMode aDTDMode);
/**
* Emits EOF.
*/
NS_IMETHOD DidBuildModel();
/**
* Forwards to nsContentSink
*/
NS_IMETHOD WillInterrupt();
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD WillResume();
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD SetParser(nsIParser* aParser);
/**
* No-op for backwards compat.
*/
virtual void FlushPendingNotifications(mozFlushType aType);
/**
* Sets mCharset
*/
NS_IMETHOD SetDocumentCharset(nsACString& aCharset);
/**
* Returns the document.
*/
virtual nsISupports *GetTarget();
// Not from an external interface
public:
// nsContentSink methods
virtual nsresult Initialize(nsIDocument* aDoc,
nsIURI* aURI,
nsISupports* aContainer,
nsIChannel* aChannel);
virtual nsresult ProcessBASETag(nsIContent* aContent);
virtual void UpdateChildCounts();
virtual nsresult FlushTags();
virtual void PostEvaluateScript(nsIScriptElement *aElement);
using nsContentSink::Notify;
// Non-inherited methods
/**
* <meta charset> scan failed. Try chardet if applicable. After this, the
* the parser will have some encoding even if a last resolt fallback.
*
* @param aFromSegment The current network buffer or null if the sniffing
* buffer is being flushed due to network stream ending.
* @param aCount The number of bytes in aFromSegment (ignored if
* aFromSegment is null)
* @param aWriteCount Return value for how many bytes got read from the
* buffer.
* @param aCountToSniffingLimit The number of unfilled slots in
* mSniffingBuffer
*/
nsresult FinalizeSniffing(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount,
PRUint32 aCountToSniffingLimit);
/**
* Set up the Unicode decoder and write the sniffing buffer into it
* followed by the current network buffer.
*
* @param aFromSegment The current network buffer or null if the sniffing
* buffer is being flushed due to network stream ending.
* @param aCount The number of bytes in aFromSegment (ignored if
* aFromSegment is null)
* @param aWriteCount Return value for how many bytes got read from the
* buffer.
*/
nsresult SetupDecodingAndWriteSniffingBufferAndCurrentSegment(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Write the sniffing buffer into the Unicode decoder followed by the
* current network buffer.
*
* @param aFromSegment The current network buffer or null if the sniffing
* buffer is being flushed due to network stream ending.
* @param aCount The number of bytes in aFromSegment (ignored if
* aFromSegment is null)
* @param aWriteCount Return value for how many bytes got read from the
* buffer.
*/
nsresult WriteSniffingBufferAndCurrentSegment(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Initialize the Unicode decoder, mark the BOM as the source and
* drop the sniffer.
*
* @param aCharsetName The charset name to report to the outside (UTF-16
* or UTF-8)
* @param aDecoderCharsetName The actual name for the decoder's charset
* (UTF-16BE, UTF-16LE or UTF-8; the BOM has
* been swallowed)
*/
nsresult SetupDecodingFromBom(const char* aCharsetName,
const char* aDecoderCharsetName);
/**
* True when there is a Unicode decoder already
*/
PRBool HasDecoder() {
return !!mUnicodeDecoder;
}
/**
* Push bytes from network when there is no Unicode decoder yet
*/
nsresult SniffStreamBytes(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Push bytes from network when there is a Unicode decoder already
*/
nsresult WriteStreamBytes(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Request event loop spin as soon as the tokenizer returns
*/
void Suspend();
/**
* Request execution of the script element when the tokenizer returns
*/
void SetScriptElement(nsIContent* aScript);
/**
* Sets up style sheet load / parse
*/
void UpdateStyleSheet(nsIContent* aElement);
// Getters and setters for fields from nsContentSink
nsIDocument* GetDocument() {
return mDocument;
}
nsNodeInfoManager* GetNodeInfoManager() {
return mNodeInfoManager;
}
nsIDocShell* GetDocShell() {
return mDocShell;
}
private:
/**
* Runs mScriptElement
*/
void ExecuteScript();
/**
* Posts a continue event if there isn't one already
*/
void MaybePostContinueEvent();
/**
* Renavigates to the document with a different charset
*/
nsresult PerformCharsetSwitch();
/**
* Parse until pending data is exhausted or tree builder suspends
*/
void ParseUntilSuspend();
private:
// State variables
/**
* Call to PerformCharsetSwitch() needed
*/
PRBool mNeedsCharsetSwitch;
/**
* Whether the last character tokenized was a carriage return (for CRLF)
*/
PRBool mLastWasCR;
/**
* The parser is in the fragment mode
*/
PRBool mFragmentMode;
/**
* The parser is blocking on a script
*/
PRBool mBlocked;
/**
* The event loop will spin ASAP
*/
PRBool mSuspending;
/**
* The current point on parser life cycle
*/
eHtml5ParserLifecycle mLifeCycle;
// script execution
/**
* Script to run ASAP
*/
nsCOMPtr<nsIContent> mScriptElement;
/**
*
*/
PRBool mUninterruptibleDocWrite;
// Gecko integration
void* mRootContextKey;
nsCOMPtr<nsIRequest> mRequest;
nsCOMPtr<nsIRequestObserver> mObserver;
nsIRunnable* mContinueEvent; // weak ref
// encoding-related stuff
/**
* The source (confidence) of the character encoding in use
*/
PRInt32 mCharsetSource;
/**
* The character encoding in use
*/
nsCString mCharset;
/**
* The character encoding to which to switch in a late <meta> renavigation
*/
nsCString mPendingCharset;
/**
* The Unicode decoder
*/
nsCOMPtr<nsIUnicodeDecoder> mUnicodeDecoder;
/**
* The buffer for sniffing the character encoding
*/
nsAutoArrayPtr<PRUint8> mSniffingBuffer;
/**
* The number of meaningful bytes in mSniffingBuffer
*/
PRUint32 mSniffingLength;
/**
* BOM sniffing state
*/
eBomState mBomState;
/**
* <meta> prescan implementation
*/
nsAutoPtr<nsHtml5MetaScanner> mMetaScanner;
// Portable parser objects
/**
* The first buffer in the pending UTF-16 buffer queue
*/
nsHtml5UTF16Buffer* mFirstBuffer; // manually managed strong ref
/**
* The last buffer in the pending UTF-16 buffer queue
*/
nsHtml5UTF16Buffer* mLastBuffer; // weak ref; always points to
// a buffer of the size NS_HTML5_PARSER_READ_BUFFER_SIZE
/**
* The HTML5 tree builder
*/
nsAutoPtr<nsHtml5TreeBuilder> mTreeBuilder;
/**
* The HTML5 tokenizer
*/
nsAutoPtr<nsHtml5Tokenizer> mTokenizer;
#ifdef DEBUG
/**
* For asserting stream life cycle
*/
eStreamState mStreamListenerState;
#endif
#ifdef GATHER_DOCWRITE_STATISTICS
nsHtml5StateSnapshot* mSnapshot;
static PRUint32 sUnsafeDocWrites;
static PRUint32 sTokenSafeDocWrites;
static PRUint32 sTreeSafeDocWrites;
#endif
};
#endif
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